Depends on the situation. If the person did not desist, then sure.
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I'm sure you can do better then that, but yeah it could end up boiling down to which ID you were arresting and what they did in responce. I cringe at the idea of officers going to fatal measures so quickly following the words "you're under arrest!" (Murika?), suddenly the term arrest no longer has meaning and yet simply saying "You're going to be murdered!" will suffice as an engagement notice to a hostile ID so you probably wouldn't get a vote for sanction from me and more a notice saying "I'm sure you can do better then that."
It's probably the simple example of the following situation: X navy say to Y suspicious transport to stop, but it keeps running to the dock point so the navy drops the further RP and just go in with guns blazing. So I guess cop said the line and seeing the person not responding just scrolled own RP to the point of gunfire directly. I might be wrong or not - the situation is represented by the little information given.
P.S. Pirates usually take transport's movement as a 'NO" by default.